The present volume, published under the title of a ' Text-Book of Materia Medica,' constitutes a second edition of the author's ' Introduction to the Study of Materia Medica ' which appeared in 1899. This change in title has been rendered desirable by the numerous additions that have been made to the work with the view of broadening its scope. To this end a chapter on the history and commerce of drugs has been added. Each section has been prefaced by a short introduction, including, in the section dealing with ' Animals and Animal Glands and Secretions,' a brief outline of modern zoological classification. For the convenience of advanced students the microscopical characters of, and assay processes for, a number of important drugs have been added. The commercial varieties have been more fully dealt with, and considerably more attention has been paid to the chemistry of a number of the more important constituents. Several drugs not previously dealt with have also been included.

The general arrangement of the subject-matter has been retained, but in several cases sections have been united or divided. The correct pronunciation of a number of Latin plant-names has been indicated by marking the quantities by the syllables.

Many of the seventy-seven new figures have been reproduced from original photographs. For those illustrating the various forms of packages I am indebted to Messrs. Wright, Layman & Umney (Figs. 6, 7, 95, 117, 177, 179, 195, 204, 205, 255, 267), and to Dr. Weigel of Hamburg (Figs. 1 to 5). To the Editor of the Pharmaceutical Journal, the Editor of the Chemist and Druggist, and to Messrs. Chas. Smith, Gowland & Son, who have given permission for the reproduction of illustrations that have appeared in their respective publications, and to the London and India Docks Company, and the proprietors of Bull Wharf who have kindly allowed me to reproduce photographs taken on their premises, my thanks are also due.

Much information respecting the commerce in drugs has been furnished by Messrs. Caesar & Loretz (Halle a. S.), Messrs. Davy, Hill & Hodgkinson, Messrs. Hearon, Squire & Francis, Messrs. Potter & Clark, and Messrs. Wright, Layman & Umney. The current literature has also been freely laid under contribution. In the work of proof-reading I have been most efficiently aided by Mr. Reginald R. Bennett, B.Sc.

The student is again strongly advised to make the study of crude drugs as far as possible a practical one. Before commencing any one of the first ten sections the morphology and anatomy of the respective organs should be studied in a text-book of botany. Each drug should be carefully compared with the description given; differences should be noted, and an explanation sought either from a teacher or from other works. Sketches should be frequently made. In the case of seeds, fruits, barks, roots and rhizomes, the prominent features of the transverse section should also be delineated, if necessary on an enlarged scale. Flowers and leaves may be expanded by soaking them in hot water. The meaning of botanical technical terms, if not precisely known, should be ascertained at the time from a suitable glossary, and a geographical atlas should also be kept at hand for reference.

H. G. G.

May 1909.